The Astrophysical Journal (Jan 2023)
AGN STORM 2. II. Ultraviolet Observations of Mrk 817 with the Cosmic Origins Spectrograph on the Hubble Space Telescope
- Y. Homayouni,
- Gisella De Rosa,
- Rachel Plesha,
- Gerard A. Kriss,
- Aaron J. Barth,
- Edward M. Cackett,
- Keith Horne,
- Erin A. Kara,
- Hermine Landt,
- Nahum Arav,
- Benjamin D. Boizelle,
- Misty C. Bentz,
- Thomas G. Brink,
- Michael S. Brotherton,
- Doron Chelouche,
- Elena Dalla Bontà,
- Maryam Dehghanian,
- Pu Du,
- Gary J. Ferland,
- Laura Ferrarese,
- Carina Fian,
- Alexei V. Filippenko,
- Travis Fischer,
- Ryan J. Foley,
- Jonathan Gelbord,
- Michael R. Goad,
- Diego H. González Buitrago,
- Varoujan Gorjian,
- Catherine J. Grier,
- Patrick B. Hall,
- Juan V. Hernández Santisteban,
- Chen Hu,
- Dragana Ilić,
- Michael D. Joner,
- Jelle Kaastra,
- Shai Kaspi,
- Christopher S. Kochanek,
- Kirk T. Korista,
- Andjelka B. Kovačević,
- Daniel Kynoch,
- Yan-Rong Li,
- Ian M. McHardy,
- Jacob N. McLane,
- Missagh Mehdipour,
- Jake A. Miller,
- Jake Mitchell,
- John Montano,
- Hagai Netzer,
- Christos Panagiotou,
- Ethan Partington,
- Richard W. Pogge,
- Luka Č. Popović,
- Daniel Proga,
- Daniele Rogantini,
- Thaisa Storchi-Bergmann,
- David Sanmartim,
- Matthew R. Siebert,
- Tommaso Treu,
- Marianne Vestergaard,
- Jian-Min Wang,
- Martin J. Ward,
- Tim Waters,
- Peter R. Williams,
- Fatima Zaidouni,
- Ying Zu
Affiliations
- Y. Homayouni
- ORCiD
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; [email protected]; Department of Astronomy and Astrophysics, The Pennsylvania State University , 525 Davey Laboratory, University Park, PA 16802, USA; Institute for Gravitation and the Cosmos, The Pennsylvania State University , University Park, PA 16802, USA
- Gisella De Rosa
- ORCiD
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; [email protected]
- Rachel Plesha
- ORCiD
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; [email protected]
- Gerard A. Kriss
- ORCiD
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; [email protected]
- Aaron J. Barth
- ORCiD
- Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California , Irvine, CA 92697-4575, USA
- Edward M. Cackett
- ORCiD
- Department of Physics and Astronomy, Wayne State University , 666 W. Hancock Street, Detroit, MI 48201, USA
- Keith Horne
- ORCiD
- SUPA School of Physics and Astronomy , North Haugh, St Andrews KY16 9SS, Scotland, UK
- Erin A. Kara
- ORCiD
- MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Hermine Landt
- Centre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham DH1 3LE, UK
- Nahum Arav
- ORCiD
- Department of Physics, Virginia Tech , Blacksburg, VA 24061, USA
- Benjamin D. Boizelle
- ORCiD
- Department of Physics and Astronomy, N284 ESC, Brigham Young University , Provo, UT 84602, USA
- Misty C. Bentz
- ORCiD
- Department of Physics and Astronomy, Georgia State University , 25 Park Place, Suite 605, Atlanta, GA 30303, USA
- Thomas G. Brink
- ORCiD
- Department of Astronomy, University of California , Berkeley, CA 94720-3411, USA
- Michael S. Brotherton
- ORCiD
- Department of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA
- Doron Chelouche
- Department of Physics, Faculty of Natural Sciences, University of Haifa , Haifa 3498838, Israel; Haifa Research Center for Theoretical Physics and Astrophysics, University of Haifa , Haifa 3498838, Israel
- Elena Dalla Bontà
- ORCiD
- Dipartimento di Fisica e Astronomia “G. Galilei,” Università di Padova , Vicolo dell’Osservatorio 3, I-35122 Padova, Italy; INAF-Osservatorio Astronomico di Padova , Vicolo dell’Osservatorio 5 I-35122, Padova, Italy
- Maryam Dehghanian
- ORCiD
- Department of Physics, Virginia Tech , Blacksburg, VA 24061, USA; Department of Physics and Astronomy, The University of Kentucky , Lexington, KY 40506, USA
- Pu Du
- ORCiD
- Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People's Republic of China
- Gary J. Ferland
- ORCiD
- Department of Physics and Astronomy, The University of Kentucky , Lexington, KY 40506, USA
- Laura Ferrarese
- ORCiD
- NRC Herzberg Astronomy and Astrophysics Research Centre , 5071 West Saanich Road, Victoria, BC, V9E 2E7, Canada
- Carina Fian
- ORCiD
- Haifa Research Center for Theoretical Physics and Astrophysics, University of Haifa , Haifa 3498838, Israel; School of Physics and Astronomy and Wise Observatory, Tel Aviv University , Tel Aviv 6997801, Israel
- Alexei V. Filippenko
- ORCiD
- Department of Astronomy, University of California , Berkeley, CA 94720-3411, USA; Miller Institute for Basic Research in Science, University of California , Berkeley, CA 94720, USA
- Travis Fischer
- ORCiD
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; [email protected]
- Ryan J. Foley
- ORCiD
- Department of Astronomy and Astrophysics, University of California , Santa Cruz, CA 92064, USA
- Jonathan Gelbord
- ORCiD
- Spectral Sciences Inc. , 4 Fourth Avenue, Burlington, MA 01803, USA
- Michael R. Goad
- ORCiD
- School of Physics and Astronomy, University of Leicester , University Road, Leicester LE1 7RH, UK
- Diego H. González Buitrago
- ORCiD
- Instituto de Astronomía, Universidad Nacional Autónoma de México , Km 103 Carretera Tijuana-Ensenada, 22860 Ensenada B.C., México
- Varoujan Gorjian
- ORCiD
- Jet Propulsion Laboratory, M/S 169-327, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
- Catherine J. Grier
- ORCiD
- Steward Observatory, University of Arizona , 933 North Cherry Ave., Tucson, AZ 85721, USA
- Patrick B. Hall
- ORCiD
- Department of Physics and Astronomy, York University , Toronto, ON M3J 1P3, Canada
- Juan V. Hernández Santisteban
- ORCiD
- SUPA School of Physics and Astronomy , North Haugh, St Andrews KY16 9SS, Scotland, UK
- Chen Hu
- Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People's Republic of China
- Dragana Ilić
- ORCiD
- Department of Astronomy, Faculty of Mathematics, University of Belgrade , Studentski trg 16,11000 Belgrade, Serbia; Humboldt Research Fellow, Hamburger Sternwarte, Universität Hamburg , Gojenbergsweg 112, D-21029 Hamburg, Germany
- Michael D. Joner
- ORCiD
- Department of Physics and Astronomy, N284 ESC, Brigham Young University , Provo, UT 84602, USA
- Jelle Kaastra
- ORCiD
- SRON Netherlands Institute for Space Research , Niels Bohrweg 4, 2333 CA Leiden, The Netherlands; Leiden Observatory, Leiden University , PO Box 9513, 2300 RA Leiden, The Netherlands
- Shai Kaspi
- ORCiD
- School of Physics and Astronomy and the Wise Observatory, Tel Aviv University , Tel Aviv 6997801, Israel
- Christopher S. Kochanek
- ORCiD
- Department of Astronomy, The Ohio State University , 140 W. 18th Ave., Columbus, OH 43210, USA; Center for Cosmology and AstroParticle Physics, The Ohio State University , 191 West Woodruff Ave., Columbus, OH 43210, USA
- Kirk T. Korista
- ORCiD
- Department of Physics, Western Michigan University , 1120 Everett Tower, Kalamazoo, MI 49008-5252, USA
- Andjelka B. Kovačević
- ORCiD
- University of Belgrade-Faculty of Mathematics , Department of Astronomy, Studentski trg 16 Belgrade, Serbia
- Daniel Kynoch
- ORCiD
- Astronomical Institute of the Czech Academy of Sciences , Boční II 1401/1a, CZ-14100 Prague, Czechia
- Yan-Rong Li
- ORCiD
- Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People's Republic of China
- Ian M. McHardy
- ORCiD
- School of Physics and Astronomy, University of Southampton , Highfield, Southampton SO17 1BJ, UK
- Jacob N. McLane
- ORCiD
- Department of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA
- Missagh Mehdipour
- ORCiD
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA ; [email protected]
- Jake A. Miller
- ORCiD
- Department of Physics and Astronomy, Wayne State University , 666 W. Hancock Street, Detroit, MI 48201, USA
- Jake Mitchell
- Centre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham DH1 3LE, UK
- John Montano
- ORCiD
- Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California , Irvine, CA 92697-4575, USA
- Hagai Netzer
- ORCiD
- School of Physics and Astronomy and the Wise Observatory, Tel Aviv University , Tel Aviv 6997801, Israel
- Christos Panagiotou
- MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Ethan Partington
- ORCiD
- Department of Physics and Astronomy, Wayne State University , 666 W. Hancock Street, Detroit, MI 48201, USA
- Richard W. Pogge
- ORCiD
- Department of Astronomy, The Ohio State University , 140 W. 18th Ave., Columbus, OH 43210, USA; Center for Cosmology and AstroParticle Physics, The Ohio State University , 191 West Woodruff Ave., Columbus, OH 43210, USA
- Luka Č. Popović
- ORCiD
- Department of Astronomy, Faculty of Mathematics, University of Belgrade , Studentski trg 16,11000 Belgrade, Serbia; Astronomical Observatory , Volgina 7, 11060 Belgrade, Serbia
- Daniel Proga
- ORCiD
- Department of Physics & Astronomy, University of Nevada , Las Vegas 4505 S. Maryland Parkway, Las Vegas, NV, 89154-4002, USA
- Daniele Rogantini
- ORCiD
- MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Thaisa Storchi-Bergmann
- ORCiD
- Departamento de Astronomia—IF, Universidade Federal do Rio Grande do Sul , CP 150501, 91501-970 Porto Alegre, RS, Brazil
- David Sanmartim
- ORCiD
- Carnegie Observatories, Las Campanas Observatory , Casilla 601, La Serena, Chile
- Matthew R. Siebert
- ORCiD
- Department of Astronomy and Astrophysics, University of California , Santa Cruz, CA 92064, USA
- Tommaso Treu
- ORCiD
- Department of Physics and Astronomy, University of California , Los Angeles, CA 90095, USA
- Marianne Vestergaard
- ORCiD
- Steward Observatory, University of Arizona , 933 North Cherry Ave., Tucson, AZ 85721, USA; DARK, The Niels Bohr Institute, University of Copenhagen , Universitetsparken 5, DK-2100 Copenhagen, Denmark
- Jian-Min Wang
- ORCiD
- Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People's Republic of China; School of Astronomy and Space Sciences, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People's Republic of China; National Astronomical Observatories of China , 20A Datun Road, Beijing 100020, People's Republic of China
- Martin J. Ward
- ORCiD
- Centre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham DH1 3LE, UK
- Tim Waters
- ORCiD
- Department of Physics & Astronomy, University of Nevada , Las Vegas 4505 S. Maryland Parkway, Las Vegas, NV, 89154-4002, USA
- Peter R. Williams
- ORCiD
- Department of Physics and Astronomy, University of California , Los Angeles, CA 90095, USA
- Fatima Zaidouni
- ORCiD
- MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Ying Zu
- ORCiD
- Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, People's Republic of China; Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University , Shanghai 200240, People's Republic of China
- DOI
- https://doi.org/10.3847/1538-4357/acc45a
- Journal volume & issue
-
Vol. 948,
no. 2
p. 85
Abstract
We present reverberation mapping measurements for the prominent ultraviolet broad emission lines of the active galactic nucleus Mrk 817 using 165 spectra obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope. Our ultraviolet observations are accompanied by X-ray, optical, and near-infrared observations as part of the AGN Space Telescope and Optical Reverberation Mapping Program 2 (AGN STORM 2). Using the cross-correlation lag analysis method, we find significant correlated variations in the continuum and emission-line light curves. We measure rest-frame delayed responses between the far-ultraviolet continuum at 1180 Å and Ly α λ 1215 Å ( ${10.4}_{-1.4}^{+1.6}$ days), N v λ 1240 Å ( ${15.5}_{-4.8}^{+1.0}$ days), Si iv + ]O iv λ 1397 Å ( ${8.2}_{-1.4}^{+1.4}$ days), C iv λ 1549 Å ( ${11.8}_{-2.8}^{+3.0}$ days), and He ii λ 1640 Å ( ${9.0}_{-1.9}^{+4.5}$ days) using segments of the emission-line profile that are unaffected by absorption and blending, which results in sampling different velocity ranges for each line. However, we find that the emission-line responses to continuum variations are more complex than a simple smoothed, shifted, and scaled version of the continuum light curve. We also measure velocity-resolved lags for the Ly α and C iv emission lines. The lag profile in the blue wing of Ly α is consistent with virial motion, with longer lags dominating at lower velocities, and shorter lags at higher velocities. The C iv lag profile shows the signature of a thick rotating disk, with the shortest lags in the wings, local peaks at ±1500 km s ^−1 , and a local minimum at the line center. The other emission lines are dominated by broad absorption lines and blending with adjacent emission lines. These require detailed models, and will be presented in future work.
Keywords